Earlier quoted context omitted.
I'm pretty sure almost everyone sending messages from an iPhone to another is using it.
I'm from Europe and live in Hong Kong, in both places, iMessage to us is like Edge for Windows users: a gimmick we see auto-installed but we dont use. So many people don't have an iPhone, and we change phone number every few months anyway. The US experience might be diff, and Europe / Asia aren't a single country, so maybe it even varies within.
> in both places
> so maybe it even varies within.
Definitely Europe is not as homogenous as that. I do also live in Europe, people do use iMessage (or just text messages in general) where I am (to a much smaller extent than the FB messenger for instance which is much bigger than WhatsApp here).
And any meaningful number of people changing their phone number every few months is certainly not my experience whatsoever. Pretty much everyone I know have had the same number of years or over a decade or even longer.